A fake explosion caused a scare at Miami International Airport Saturday night, after an airport employee discovered an unattended bag in a concourse restroom.

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Police said the employee found what looked like a grenade in the bag. The area was cleared and a bomb squad was called in.

After about two hours, police determined the threat wasn't real and allowed passengers to re-enter. Officials said about seven flights were delayed as a result of the incident, leaving some passengers stranded.

Police don't know if the bag was placed in the restroom on purpose or whether they will file charges.